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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
 
int cmp(const void *p1, const void *p2)
{
  const char (*ps1)[255] = p1;
  const char (*ps2)[255] = p2;
 
  return strcmp(*ps1, *ps2);
}
 
int main() {
    FILE *f = fopen("data.txt", "r");
    char s[255][255];
    char tmp[255];
    int n = 0;
 
    while (!feof(f)) {
        fscanf(f, "%s", tmp);
        strcpy(s[n], tmp);
        n++;
    }
 
    fclose(f);
 
    qsort(s, n, sizeof(char *), cmp);
 
    int i = 0;
    for (; i < n; i++) {
        printf("%s ", s[i]);
    }
 
    return EXIT_SUCCESS;
}
 

prog.c: In function ‘cmp’:
prog.c:9:28: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
   const char (*ps1)[255] = p1;
                            ^~
prog.c:10:28: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
   const char (*ps2)[255] = p2;
                            ^~
cc1: all warnings being treated as errors

Standard output is empty